Corrosion Resistance and Electrochemical Behaviour of Amorphous Ni84.9Cr7.4Si4.2Fe3.5 Alloy in Alkaline and Acidic Solutions

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2019,（11）
• 页码范围: 1421-1436
• 页数: 16页
• 语种: 英文

摘要

In this work,the corrosion behaviours of the amorphous Ni84.9Cr7.4Si4.2Fe3.5 alloy and its crystalline counterpart are studied in acidic,neutral,and alkaline solutions by scanning electron microscopy,electrochemical impedance spectroscopy,and potentiodynamic and potentiostatic polarization tests· X-ray photoelectron spectroscopy and scanning Kelvin probe are employed to characterize the alloy surface· The results show that the amorphous Ni84.9Cr7.4Si4.2Fe3.5 alloy presents a better corrosion resistance compared to its crystalline counterpart,which is attributed to the uniform energy distribution of the atoms on the amorphous alloy surface,and this presents as a uniform electric potential map to effectively suppress the occurrence of the corrosion cell reaction.